<!DOCTYPE html>
<meta charset="utf-8">
<title>Test reference</title>
<link rel="author" title="Florian Rivoal" href="http://florian.rivoal.net/">
<style>
div {
  font-size: 2em;
  border: solid black;
  margin: 5px;
  width: 30ch;
}
#ref {
  border-color: blue;
}
u {  background: silver; }
b {  background: green; }
em { background: gray; }
</style>

<p>Test passes if the black box is identical to the blue one.

<div lang=th>กรุงเทพ <b><u>คือ</u> <em>สวยง</em></b>าม</div>
<div id=ref lang=th>กรุงเทพ <b><u>คือ</u> <em>สวยง</em></b>าม</div>
